Dental draw-press.



No. 772.907. I v 7 PATENTED 007:. 18, 1904. H.E.REYNOLDS.

DENTAL DRAW PRESS.

APPLICATION FILED 11120., 2a, 1903.

N0 MODEL.-

, invents-c muhmw' I 96% 464/ 0 7' M 7 No. 772,9o7.

UNITED STATES Patented October 18,1904.

PATE T OFFICE;

DENTAL DRAW-PRESS.

SPECIFICATION forming part of Letters Patent No. 772,907, dated October 18, 1904.

Application filed December 28, 1903. Serial No. 186,778. (No model.)

To all whom it may concern:

Be it known that I, HERMAN E. REYNOLDS, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented certain new and useful lmprovements in Dental Draw-Presses; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to dental presses, and pertains especially to a dental draw-press for drawing cups, caps, or seamless metal blanks in dental crownwork.

The object of the invention is to provide a draw-press having such construction and arrangement of parts that the die-plate is revolubly attached to a vertically-movable shaft, and the draw-punches are held against vertical movement and revoluble in unison with the die-plate.

A further object of the invention is to pro- I vide a dental draw-press having a peculiar frame, from the top of which is revolubly' hung draw punches fixed against vertical movement, and in the lower portion of said frame is revolubly held a circular rack-shaft,

raised and lowered by a toothed hand-lever, to

have a die-plate carried by the shaft cooperatewith the draw-punches.

Other objects, ad vantages, and improved results will be found in the practical application of the press, especially in the expeditious operation thereof, whereby much time and labor is saved in producing dental crown-blanks.

As far as known to me presses of this character have the die-plate fixed to the pressframe, and the draw-punches are fed to the said plate by a screw-shaft or by a rack and pinion, such rack not being permitted to revolve and such shaft not being capable of vertical movement without turning it. Therefore it is the purpose of this invention to overcome the disadvantages,objections, and inconveniences of the above-noted presses and to furnish a press of such novel and peculiar construction and arrangement of parts that its and expeditiously.

In the accompanying drawings, forming part of this application, Figure 1 is an elevation. Fig; 2is a vertical sectional view.' Fig. 3 isa cross-section on the line on kn, Fig. 1. Fig. 4 is a top view. v

The same numeral references denote the drawings.

The press-frame consists of a base 1, a main body 2, joined to the base by a neck 3, having a central bore 4 extending from the base centrally through the body 2, flanges 5, with an opening or slot 6 between them extending into or in communication with the bore 4, an arm 7 positioned centrally above the bore, and a stem 8 connecting the arm with the side of the body 2 opposite the flanges. The draw-punches 9, which are of the usual graduated sizes, are fixed to and depend from a punch-plate 10, having a pivot-bolt 11 extending through the end of the arm7 and provided with a nut 12 to revolubly connect the punch-plate to the arm without permitting vertical movement of'the punches. The dieplate15 has apertures 18, through which work guide-rods 14, attached to and projecting from the plate 10. The plate 15 has holes 16 of standard gage to register with the punches.

5 5 same parts throughout the several views of the I Said rods ldconnect the plates and prevent' upon the body 2 when not in operation. Said shaft has end bearings 19 and a circular rack extending from one to the other of thebearings. This rack is formed by a series of parallel ribs or beads 20 and spaces or grooves 21intervening the ribs, the latter being made horizontally across the shaft at right angles thereto and are not inclined or pitched in screw fashion. The hand-lever 22 has a toothed segment 23 pivoted to and between the flanges 5, the segment-teeth extending through the opening or slot 6 into the path of the shaft, so as to mesh with the ribs.

It will be seen that the die-plate may be raised and lowered by moving the handle, which raises and lowers the shaft without turning it. Yet should the die-plate adhere to the shaft or should they be fixed together the shaft may be turned by and with the plate regardless of the vertical position of the shaft without altering such vertical position, provided the hand-lever is held against movement.

It is obvious that the least movement of the hand-lever will be imparted to the die-plate through the shaft-rack-without any lost motion, that the shaft is free 'to be turned, if desired, but it is not turned by the segment, and that a direct vertically-moving power is applied to the shaft from the hand-lever.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A dental press having a die-plate shaft revoluble in the press-frame and provided with circular horizontally-parallel ribs, and means engaging the ribs for raising and lo wering the die-plate without revolving the shaft.

2. A dental press having a shaft loosely mounted in the press-frame so as to be revolved without vertical movement, a die-plate carried by the shaft, a rack formed on the shaft by circular ribs, and a hand-lever having a toothed segment meshing with the rack to effect vertical movement of the shaft without turning it.

3. In a dental press, the combination, with the frame having a central bore from the frame-base to the seat of the die-plate, of the shaft loosely mounted in the bore and having circular horizontal ribs, the die-plate carried by the shaft, and the hand-lever having a toothed segment meshing with said ribs.

a. In a dental press, the combination, with the frame having a central bore, an opening from the bore through the side of the frame, draw-punches revolubly held pendent from an arm of the frame against vertical movement, and the vertically-movable die-plate, of the shaft carrying the die-plate and revolubly contained in the bore, a rack formed on the shaft by a series of circular ribs and grooves, and a hand-lever having a toothed segment operated in the said opening in mesh with the rack to effect vertical movement of the shaft without turning it.

In testimony whereof I aliix my signature in presence of two witnesses.

HERMAN E. REYNOLDS.

Witnesses:

- STANLEY A. Mnnutnr,

SIeMoNn FUZAK. 

